Elastic die-stock.



T. A. GAIN. ELASTIC DIE STOCK. APPLICATION rum) MAR. so, 1906.

Patented June 15,1909.

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@H fozmms UNTTED STATES PATENT OFFTOE.

THOMAS A. CAIN, OF GREENFIELD, MASSACHUSETTS, ASSIGNOR TO WILEY &RUSSELL MANUFACTURING CO MASSACHUSETTS.

OF GREENFIELD, MASSACHUSETTS, A CORPORATION OF ELASTIC DIE-STOCK.

To all whom it may concern:

Be it known that I, THOMAS A. CAIN, a citizen of the United States,residing at Greenfield, in the county of Franklin and State of hlassachusetts, have invented certain new and useful Improvements inElastic Die-Stocks; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to improvements in elastic die stocks, and theobject of my invention is to provide a simple device of this characterin which the die stock may be positively opened or closed by themovement of a single screw.

With this object in view, my invention consists in the construction andcombinations of parts as hereinafter described and claimed.

In the accompanying drawing Figure 1 is a top plan view of a die stock,showing my invention as applied thereto. Fig. 2 is a cross section ofthe same on the line 2-2 of Fig. 1. Fig. 3 is a side view of the screw,and Fig. t represents the nut for the screw in two positions.

a represents the body portion of an elastic die stock, made in acircular form and split as shown at 5. Near the point where the stock iscut, it is provided with two projecting portions 0 and (Z, both of theseprojections being perforated, and the perforations in the projection 0being provided with an ordinary internal screw-thread. The stock is alsoprovided with cut-away portions for the reception of the handles, shownin dotted lines, and with projecting portions 0 which limit the motionof the projections c and (Z toward each other.

The screw for opening and closing the die stock is shown in Fig. 3, andcomprises an enlarged head f provided with a perforation 9 into which arod may be inserted for the purpose of turning the screw. This screw isalso provided with a smaller cylindrical portion h, loosely fitting inthe perforation Specification of Letters Patent.

Application filed March 30, 1908.

Patented June 15, 1909.

Serial No. 424,128.

in the projection (Z, and with a left-hand screw-threaded portion 2' anda right-hand screw-threaded portion j, the latter being of smallerdiameter.

70 represents an internally screw-threaded nut with the threads cut soas to engage the screw-threaded portion 2', so that it may be easilyengaged by a spanner.

Elastic stocks are well known, and such stocks have usually beenprovided with screws for closing them. By the present arrangement of ascrew provided with two opposite threads, one right-hand and oneleft-hand, in combination with a nut which fits the left-hand thread,the stock can be both positively opened and closed by the movement ofthe screw. then the screw is turned to close the stock the pressurecomes on the shouldered head of the screw. the nut 7c remaining free.When the screw is turned to open the stock the pressure comes on theleft-hand face of the nut is, and the thread of said nut beingleft-handed the tendency is to keep the nut snugly in place while theright-hand screw opens the stock to the desired point.

Having thus described my invention, I clain In a die stock, thecombination of an elastic member having a central circular perforation,said member being slit on one side and provided with projectionsadjacent to the slit, said projections being perforated and cut away forthe reception of a nut and. one of said projections being screwthreaded, a screw provided with right handed and left handed screwthreads, said screw being adapted to pass through the perforations insaid projections, and a nut located between said projections and adaptedto engage one of the screw threads on said screw, substantially asdescribed.

In testimony whereof, I affix my signature in presence of two witnesses.

THOMAS A. CAIN.

Vitnesses ELLEN K. OKnnrn, FRANCIS NIMs THoMrsoN.

